<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .row div {
            height: 50px;
            background-color: pink;
        }
    </style>
</head>

<body>
    <div class="container">
        <div class="row">
            <div class="col-md-4">左侧</div>
            <div class="col-md-4 col-md-offset-4">右侧</div>

            <div>3</div>

        </div>

    </div>
</body>

</html>